Effect of Using GFRP Reinforcement on the Behavior of Hollow-Core Circular Concrete Columns
Publication: Journal of Composites for Construction
Volume 25, Issue 1
Abstract
Hollow-core concrete columns are widely used as structural members to reduce the cost and self-weight of concrete structures. This study investigates the axial load–axial deformation behavior of glass fiber-reinforced polymer (GFRP) bar- and helix-reinforced hollow-core circular concrete columns. Four specimens of 214-mm outer diameter and 56-mm circular inner hole diameter with a height of 850 mm were tested under axial compression. One specimen was reinforced with steel bars and steel helices, and the remaining three specimens were reinforced with GFRP bars and GFRP helices. It was found that, for a similar amount of longitudinal and transverse reinforcements, the GFRP bar-reinforced specimen achieved 15% and 4% higher effectiveness of confinement reinforcement and ductility, respectively, than the steel bar-reinforced specimen. The effectiveness of confinement reinforcement and ductility of the GFRP bar-reinforced specimen was higher for the smaller pitch of GFRP helices. The GFRP bar-reinforced specimen with helices of 30 mm pitch achieved 46% and 66% higher effectiveness of confinement reinforcement and ductility, respectively, than the GFRP bar-reinforced specimen with helices of 90 mm pitch.
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Acknowledgments
The second author acknowledges the joint support and funding from the Higher Education Commission (HEC) of Pakistan and the University of Wollongong, Australia. The authors acknowledge the technical support provided by the technical staff, especially Mr. Ritchie Maclean of the high bay laboratories of the School of Civil, Mining and Environmental Engineering, University of Wollongong, Australia. The authors also acknowledge Mateen Bar, Pultron Composites Ltd (Mateen Bar), especially Mr. Ian Cumming of IRC Pvt Ltd for providing GFRP bars and helices.
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Published In
Journal of Composites for Construction
Volume 25 • Issue 1 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jun 12, 2020
Accepted: Sep 24, 2020
Published online: Dec 7, 2020
Published in print: Feb 1, 2021
Discussion open until: May 7, 2021
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